Improvement in lifting-jacks



@tutti @wird Cuitcd tant L Letters Patent No. 102,493, dated May 3, 1870.

IMPRQVBMENT IN LIrTING-JACKS.

The Schedule referred to inl these Letters Patent andrnaaking` part of the same.

To 'whom it may concern.-

Beit known that L'WILLIAM CLARK, of Decatur,

in the county of Mason and in the State of Illinois,-

, ing the standard of a lifting-jack in two' pieces of vdifferent lengths, the lower piece hinged to the upper, and is of about six inches in length. The lower piece is under the upper piece while lifting a large wheel, and is turned upon the hinge by the side ofthe upper piece while lifting a small wheel, as will be more fully hereinafter described. v

To enable others skilled in the art to make and use my invention, I will now proceed to describe its construction and operation.

In the drawing- A is the upper piece of the standard of the jack, and Bis the lower piece, and C is the hinge uniting them.

D is the lifting-jack lever, and d is its fulcrnm.

The jack is placed in the position shown in the drawing when a large wheel having its axis rather high is to he lifted, and, by bearing the handle of lever D downward, the axle is lifted to the top vof the standard, on which it is allowed to rest while the wheel is l washed or attended to, as necessity requires. By a reverse operation, the axle and wheel are lowered when desired. I

Now, when it is desired to perform either of these operations on a small wheel, the salue movements are performed, as just described, after the lower piece B ofthe standard has been tu'rned upas represented by red lines in the drawing, and the lower end of the piece A placed on the ground,

The hinge O is a common butt-hinge, and I shall ordinarily use it in preference to any other, but a cheap y and eicient substitute might he made of leather..

The advantage my jack has over other jacks consistsin the extreme simplicity of the hinged joint, by whichv'I can more quickly 'alter and adjust my jack to lift dierent-sized wheels, and because of the curved end or head ofthe post, and the shape ofthe lever to correspond with the same from the position in which it is attached to the post, causing the weight to be lifted to be raised on and around the curved end of the post until it (the weight) is brought to the apex of thev posti, where the weightjthe axle) will rest without the interposition ofany otherlmeans.

In a full-sized working-machine the post will be .about two (2)"feet two(2) inches in-length, three (3) inches square at the base, and at the top vabout t'wo and a half (25) inches through'. The length of the lever, twenty-two (22) inches. The bolt-hole will be about three (3) inches from the lifting-end, through whichv the bolt passes and serves as the levers fulerum. The plates e, to receivethe bolts and strengthen the post, are from four (4) to sixl (6) inches long, and about two (2) inches wide, of ordinary plate-iron or brass. y v

Having thus fully described my invention,

WhatI elaimf as new, and desire to'secure by Letters Iatent, is

The combination of the hinged post AB with the curved top lever D, and plates or bearings e, when constructed and arranged 4as described, and operating in the manner and for the purposes substantially as set forth'.

In testimony that I claim the abovedescribed improvements in lifting-jacks, I have hereunto signed my name this 7th day of May, 1869.

' WILLIAM CLARK. Witnesses:

MARTIN P. MURPHEY, IRA B. CURTIS. v 

